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In a study by Web Criteria, it took an average of 2.1 minutes to locate information and buy products on the Delta Airlines website, compared to an average of 2.7 minutes on the British Airways site. Assume that the data in file XR11012 contains the times (in minutes) required during visits to the two websites. In a suitable one-tail test at the 0.01 level, was the mean time for the Delta visits significantly less than that for the British Airway visits? Identify and interpret the p-value for the test.
If battery posts are larger than 3.5 centimeters or less than 3.30 centimeters, they will be scrapped. Determine the proportion scrapped?
Explain how the power of hypothesis test is influenced by each of the following. Assume that all other factors are held constant. Increasing the alpha level from .01 to .05.
In patients with congestive heart failure, two or more drugs were prescribed in 257 of 437 U.S. patients. In Scotland, 39 of 179 patients had two or more drugs prescribed
The 99% confidence interval estimate for a population variance when a sample standard deviation of 12 is obtained from a sample of 10 items is:
The manager of a local bank wants to estimate the average amount held in checking accounts by the customers. A random sample of 30 customers is selected, and the results indicate a sample average of $4,750 and a sample standard deviation of $1,200..
A company's net sales is $ million from 1993-2002, determine the least squares equation and based on this info, what are the estimated sales for 2005?
The histograms of some sampling distributions are symmetrical. T-F What would make a histogram symmetrical, and give an example of a symmetrical distribution? A random sample of size 36 is to be selected from a population that has a mean μ = 50 an..
A research repot from an independent-measures study states that there are significant differences between treatments, F(2, 54) =3.58, p
The dealership would now like some general information based on the entire sample of vehicles. Calculate and explain the following:
Do the data indicate a significant difference between the frequency distributions for male and females? Test at the .05 level of significance and describe the difference.
In what height interval must the company expect to determine middle 70% of kindergarteners?
Components shipped include 0.5% defectives. You plan to select 80 items; if 0 are defective, you will assume all are okay.
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